/* ==========================================================
   启天和科技 · 官网
   视觉：工程图纸。深海军蓝晒图 + 绘图纸白，工程橙做标注色，
   红色印章表示项目状态。
   ========================================================== */

@font-face {
  font-family: "QTH Serif";
  src: url("../fonts/qth-serif.woff") format("woff");
  font-weight: 700;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-latin-500-normal.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("../fonts/jetbrains-mono-latin-700-normal.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --navy: #0b1d2b;
  --navy-2: #10283a;
  --paper: #eceee9;
  --paper-2: #f6f7f3;
  --ink: #0e1a24;
  --ink-2: #4b5a66;
  --pale: #c4dbec;
  --pale-2: #7f9bb0;
  --orange: #ff6a2b;
  --orange-tint: #ffe4d7;
  --green: #5faa3a;
  --seal: #c8322b;

  --f-serif: "QTH Serif", "Songti SC", "STSong", "SimSun", serif;
  --f-sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --gut: clamp(20px, 5.5vw, 96px);
  --inset: 14px;

  /* 固定 UI（图框、导航、光标）跟随当前图纸底色切换 */
  --ui: var(--pale);
  --ui-dim: rgba(196, 219, 236, .35);
  --ui-bg: rgba(11, 29, 43, .82);
}
body.on-paper {
  --ui: var(--ink);
  --ui-dim: rgba(14, 26, 36, .3);
  --ui-bg: rgba(236, 238, 233, .86);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }
body {
  margin: 0;
  background: var(--navy);
  color: var(--pale);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.is-loading { overflow: hidden; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ol, ul, dl, dd, figure { margin: 0; padding: 0; }
ol, ul { list-style: none; }
::selection { background: var(--orange); color: var(--ink); }

@media (pointer: fine) {
  body, a, button { cursor: none; }
}

/* ---------------- 加载 ---------------- */
.loader {
  position: fixed; inset: 0; z-index: 100;
  background: var(--navy);
  display: grid; place-items: center;
}
.loader__box { width: 180px; color: var(--pale); font-family: var(--f-mono); }
.loader__mark { width: 120px; height: 120px; display: block; margin: 0 auto 18px; overflow: visible; }
.loader__stroke { fill: none; stroke: var(--pale); stroke-width: 1.2; }
.loader__mark path:nth-child(2) { stroke: var(--orange); }
.loader__meta { display: flex; justify-content: space-between; font-size: 11px; letter-spacing: .12em; border-top: 1px solid var(--ui-dim); padding-top: 8px; }
.loader__count { color: var(--orange); }
.loader__label { font-family: var(--f-sans); font-size: 12px; letter-spacing: .5em; text-align: center; margin-top: 10px; color: var(--pale-2); }

/* ---------------- 图框 ---------------- */
.frame {
  position: fixed; inset: var(--inset); z-index: 40;
  border: 1px solid var(--ui-dim);
  pointer-events: none;
  transition: border-color .4s;
}
.frame__refs {
  position: absolute; display: flex; justify-content: space-around;
  font: 500 9px/1 var(--f-mono); color: var(--ui-dim); letter-spacing: .08em;
  transition: color .4s;
}
.frame__refs span { position: relative; }
.frame__refs--top { top: -1px; left: 0; right: 0; transform: translateY(-100%); padding-bottom: 2px; }
.frame__refs--bottom { bottom: -1px; left: 0; right: 0; transform: translateY(100%); padding-top: 2px; }
.frame__refs--left, .frame__refs--right { top: 0; bottom: 0; flex-direction: column; align-items: center; width: var(--inset); }
.frame__refs--left { left: calc(var(--inset) * -1); }
.frame__refs--right { right: calc(var(--inset) * -1); }
.frame__refs--top span::after, .frame__refs--bottom span::after {
  content: ""; position: absolute; left: 50%; width: 1px; height: 5px; background: var(--ui-dim);
}
.frame__refs--top span::after { top: 100%; }
.frame__refs--bottom span::after { bottom: 100%; }

/* ---------------- 光标 ---------------- */
.cursor { position: fixed; inset: 0; z-index: 90; pointer-events: none; display: none; }
@media (pointer: fine) { .cursor { display: block; } }
.cursor__h, .cursor__v { position: absolute; background: var(--ui-dim); transition: background .4s; }
.cursor__h { left: 0; right: 0; height: 1px; top: 0; }
.cursor__v { top: 0; bottom: 0; width: 1px; left: 0; }
.cursor__box {
  position: absolute; top: 0; left: 0; width: 22px; height: 22px; margin: -11px 0 0 -11px;
  border: 1px solid var(--orange);
  transition: width .25s, height .25s, margin .25s, background .25s;
}
.cursor.is-hover .cursor__box { width: 52px; height: 52px; margin: -26px 0 0 -26px; background: rgba(255, 106, 43, .12); }
.cursor__read {
  position: absolute; top: 0; left: 0; transform: translate(16px, 14px);
  font: 500 10px/1 var(--f-mono); color: var(--orange); letter-spacing: .06em; white-space: nowrap;
}

/* ---------------- 导航 ---------------- */
.nav {
  position: fixed; z-index: 50;
  top: calc(var(--inset) + 1px); left: calc(var(--inset) + 1px); right: calc(var(--inset) + 1px);
  height: 64px; padding: 0 22px;
  display: flex; align-items: center; gap: 28px;
  color: var(--ui);
  background: var(--ui-bg);
  backdrop-filter: saturate(1.2);
  border-bottom: 1px solid var(--ui-dim);
  transition: color .4s, background .4s, border-color .4s;
}
.nav__brand { display: flex; align-items: center; gap: 12px; }
.nav__brand img { width: 42px; height: 28px; display: block; }
.nav__name { font-family: var(--f-serif); font-weight: 700; font-size: 18px; letter-spacing: .08em; }
.nav__en { font: 500 10px/1 var(--f-mono); letter-spacing: .3em; opacity: .55; padding-left: 12px; border-left: 1px solid var(--ui-dim); }
.nav__links { display: flex; gap: 6px; margin-left: auto; }
.nav__links a {
  position: relative; padding: 8px 12px; font-size: 14px; letter-spacing: .12em;
  display: inline-flex; align-items: baseline; gap: 6px;
}
.nav__links a i { font: normal 500 10px/1 var(--f-mono); color: var(--orange); }
.nav__links a::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 2px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: right; transition: transform .35s;
}
.nav__links a:hover::after, .nav__links a.is-current::after { transform: scaleX(1); transform-origin: left; }
.nav__sheet { font: 500 12px/1 var(--f-mono); letter-spacing: .1em; padding-left: 20px; border-left: 1px solid var(--ui-dim); }
.nav__sheet-no { color: var(--orange); font-size: 20px; font-weight: 700; }

/* ---------------- 标题栏 ---------------- */
.titleblock {
  position: fixed; z-index: 45;
  right: calc(var(--inset) + 1px); bottom: calc(var(--inset) + 1px);
  width: 250px; color: var(--ui); background: var(--ui-bg);
  border-top: 1px solid var(--ui-dim); border-left: 1px solid var(--ui-dim);
  font: 500 11px/1 var(--f-mono);
  transition: color .4s, background .4s, opacity .4s, transform .4s;
}
body.at-end .titleblock { opacity: 0; transform: translateY(12px); }
.titleblock__row { display: flex; border-bottom: 1px solid var(--ui-dim); }
.titleblock__row span, .titleblock__row b { padding: 8px 10px; }
.titleblock__row span { opacity: .55; font-weight: 400; border-right: 1px solid var(--ui-dim); font-family: var(--f-sans); letter-spacing: .1em; }
.titleblock__row b { flex: 1; font-weight: 500; letter-spacing: .06em; }
.titleblock__row b + span { border-left: 1px solid var(--ui-dim); flex: none; white-space: nowrap; }
.titleblock__row span { white-space: nowrap; }
.titleblock__name { font-family: var(--f-sans); letter-spacing: .2em !important; }
.titleblock__no { font-style: normal; color: var(--orange); }
.titleblock__scale { position: relative; height: 26px; display: flex; align-items: center; justify-content: flex-end; padding: 0 10px;
  background-image: repeating-linear-gradient(90deg, var(--ui-dim) 0 1px, transparent 1px 12.5px); background-size: 100% 6px; background-repeat: no-repeat; background-position: 0 100%; }
.titleblock__scale i { position: absolute; left: 0; bottom: 0; height: 6px; width: 100%; background: var(--orange); transform-origin: left; transform: scaleX(0); }
.titleblock__pct { opacity: .7; }

/* ---------------- 图纸通用 ---------------- */
.sheet {
  position: relative;
  padding: clamp(120px, 16vh, 170px) var(--gut) clamp(90px, 12vh, 140px);
  overflow: hidden;
  overflow: clip;
}
.sheet--dark { background: var(--navy); color: var(--pale); }
.sheet--paper { background: var(--paper); color: var(--ink); }
.grid-bg {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(150, 190, 220, .1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 190, 220, .1) 1px, transparent 1px),
    linear-gradient(rgba(150, 190, 220, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(150, 190, 220, .045) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  background-position: -1px -1px;
}
.grid-bg--paper {
  background-image:
    linear-gradient(rgba(14, 26, 36, .085) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 26, 36, .085) 1px, transparent 1px),
    linear-gradient(rgba(14, 26, 36, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 26, 36, .035) 1px, transparent 1px);
}
.sheet__head { position: relative; max-width: 1400px; margin: 0 auto clamp(48px, 7vh, 88px); }
.sheet__head--row { display: flex; justify-content: space-between; align-items: flex-end; gap: 48px; }
.sheet__no { font: 500 12px/1 var(--f-mono); letter-spacing: .22em; color: var(--orange); margin-bottom: 22px; }
.sheet__title {
  font-family: var(--f-serif); font-weight: 700;
  font-size: clamp(34px, 4.6vw, 72px); line-height: 1.12; letter-spacing: .01em;
}
.sheet__aside { max-width: 360px; font-size: 14px; line-height: 1.8; opacity: .72; padding-left: 18px; border-left: 1px solid currentColor; }
.figure-note { font: 400 11px/1 var(--f-mono); letter-spacing: .1em; opacity: .6; margin-top: 12px; text-align: center; }

/* SplitText 行遮罩 */
.split-mask { overflow: hidden; padding-bottom: .06em; margin-bottom: -.06em; }

/* ---------------- 按钮 ---------------- */
.btn {
  position: relative; display: inline-flex; align-items: center; gap: 14px;
  height: 54px; padding: 0 26px; overflow: hidden;
  font-size: 15px; letter-spacing: .12em; font-weight: 600;
  border: 1px solid currentColor;
}
.btn span, .btn b { position: relative; z-index: 1; transition: color .35s; }
.btn b { font-weight: 400; font-size: 18px; }
.btn::before {
  content: ""; position: absolute; inset: 0; transform: scaleY(0); transform-origin: bottom;
  transition: transform .45s cubic-bezier(.7, 0, .2, 1);
}
.btn--solid { background: var(--orange); border-color: var(--orange); color: var(--ink); }
.btn--solid::before { background: var(--paper-2); }
.btn--line { color: var(--pale); font-family: var(--f-mono); font-weight: 500; letter-spacing: .04em; }
.btn--line::before { background: var(--pale); }
.btn:hover::before { transform: scaleY(1); }
.btn--line:hover span { color: var(--navy); }

/* ---------------- SHEET 01 首屏 ---------------- */
.hero { height: 100vh; min-height: 640px; padding: 0; }
.hero__canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.hero__inner {
  position: absolute; left: var(--gut); bottom: clamp(88px, 13vh, 150px);
  width: min(900px, 66vw); z-index: 2;
}
.kicker { font: 500 11px/1 var(--f-mono); letter-spacing: .24em; color: var(--pale-2); margin-bottom: 28px; display: flex; align-items: center; gap: 12px; }
.kicker__dot { width: 8px; height: 8px; background: var(--orange); display: inline-block; animation: blink 1.6s steps(2) infinite; }
@keyframes blink { 50% { opacity: .15; } }
.hero__title {
  font-family: var(--f-serif); font-weight: 700; color: #f1f5f8;
  font-size: clamp(38px, 5.6vw, 100px); line-height: 1.06; letter-spacing: -.005em;
}
.hero__title .line { display: block; }
.dim { display: flex; align-items: center; gap: 0; color: var(--orange); margin: 26px 0 26px; width: min(560px, 100%); }
.dim__tick { width: 1px; height: 16px; background: currentColor; flex: none; }
.dim__rule { height: 1px; background: currentColor; flex: 1; position: relative; }
.dim__rule:first-of-type::before, .dim__rule:last-of-type::after {
  content: ""; position: absolute; top: -4px; width: 0; height: 0; border: 4.5px solid transparent;
}
.dim__rule:first-of-type::before { left: 0; border-right-color: currentColor; border-left: 0; }
.dim__rule:last-of-type::after { right: 0; border-left-color: currentColor; border-right: 0; }
.dim__label { font: 500 12px/1 var(--f-mono); letter-spacing: .14em; padding: 0 14px; white-space: nowrap; }
.hero__lead { font-size: clamp(15px, 1.15vw, 18px); line-height: 1.9; max-width: 560px; color: #b9cfdf; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.hero__nodes li {
  position: absolute; left: 0; top: 0; z-index: 3;
  font: 500 12px/1.2 var(--f-sans); letter-spacing: .12em; color: #eef4f8;
  transform: translate(-50%, 32px); opacity: 0; white-space: nowrap; text-align: center;
}
.hero__nodes li b { display: block; font: 700 10px/1 var(--f-mono); color: var(--orange); letter-spacing: .1em; margin-bottom: 5px; }
.hero__caption { position: absolute; right: calc(var(--gut) + 250px); bottom: clamp(88px, 13vh, 150px); font: 400 11px/1 var(--f-mono); color: var(--pale-2); letter-spacing: .08em; text-align: right; }
.hero__caption span { display: block; }
.hero__caption-b { position: absolute; right: 0; top: 0; opacity: 0; white-space: nowrap; }
.hero__morphline {
  position: absolute; left: 50%; top: clamp(96px, 15vh, 150px); transform: translateX(-50%); z-index: 2;
  font-family: var(--f-serif); font-weight: 700; font-size: clamp(24px, 2.6vw, 40px); line-height: 1.35;
  color: #f1f5f8; text-align: center; opacity: 0; white-space: nowrap;
}
.hero__scroll { position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%); font: 400 11px/1 var(--f-sans); letter-spacing: .4em; color: var(--pale-2); display: flex; flex-direction: column; align-items: center; gap: 12px; }
.hero__scroll i { width: 1px; height: 46px; background: linear-gradient(var(--orange), transparent); animation: drop 1.8s cubic-bezier(.6, 0, .3, 1) infinite; transform-origin: top; }
@keyframes drop { 0% { transform: scaleY(0); } 50% { transform: scaleY(1); } 100% { transform: scaleY(1); opacity: 0; } }

/* ---------------- SHEET 02 能力 ---------------- */
.cap__body { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 96px); align-items: start; }
.cap__figure { position: sticky; top: 110px; }
.iso { width: 100%; height: auto; display: block; overflow: visible; }
.iso .axis { stroke: var(--ink); stroke-width: 1; stroke-dasharray: 22 5 3 5; opacity: .45; }
.iso .hatch { stroke: var(--ink); stroke-width: 1; opacity: .35; }
.plate__top { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.3; transition: fill .45s, stroke .45s; }
.plate__side { fill: #d3d8d2; stroke: var(--ink); stroke-width: 1.3; }
.plate__side--r { fill: #bfc6c0; }
.plate__grid { stroke: var(--ink); stroke-width: .8; opacity: .45; fill: none; }
.plate__ports rect { fill: none; stroke: var(--ink); stroke-width: 1.1; }
.plate__core { fill: none; stroke: var(--ink); stroke-width: 1.3; }
.plate__core--in { fill: var(--ink); }
.plate__hatch { stroke: none; }
.plate.is-active .plate__top { fill: var(--orange-tint); stroke: var(--orange); }
.plate.is-active .plate__core--in { fill: var(--orange); }
.leader polyline { fill: none; stroke: var(--ink); stroke-width: 1; }
.leader text { font: 500 13px var(--f-sans); fill: var(--ink); letter-spacing: .06em; }
.leader.is-active polyline { stroke: var(--orange); }
.leader.is-active text { fill: var(--orange); }
.leader circle { fill: var(--ink); }
.leader.is-active circle { fill: var(--orange); }

.cap__list { counter-reset: cap; }
.cap__item {
  position: relative; min-height: 46vh; padding: 34px 0 60px; border-top: 1px solid rgba(14, 26, 36, .25);
  opacity: .3; transition: opacity .5s;
}
.cap__item.is-active { opacity: 1; }
.cap__item::before {
  content: ""; position: absolute; top: -1px; left: 0; height: 1px; width: 100%; background: var(--orange);
  transform: scaleX(0); transform-origin: left; transition: transform .8s cubic-bezier(.7, 0, .2, 1);
}
.cap__item.is-active::before { transform: scaleX(1); }
.cap__no { font: 700 13px/1 var(--f-mono); color: var(--orange); letter-spacing: .12em; }
.cap__item h3 { font-family: var(--f-serif); font-size: clamp(28px, 2.6vw, 42px); line-height: 1.2; margin: 14px 0 16px; }
.cap__item p { font-size: 17px; line-height: 1.9; color: var(--ink-2); max-width: 520px; }
.cap__tag { display: inline-block; margin-top: 22px; font: 500 11px/1 var(--f-mono); letter-spacing: .14em; padding: 8px 10px; border: 1px dashed rgba(14, 26, 36, .4); }

/* ---------------- SHEET 03 落地 ---------------- */
.run { padding: 0; }
.run__pin { position: relative; min-height: 100vh; padding: clamp(110px, 15vh, 150px) var(--gut) 70px; }
.run__body { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 72px); }
.log { border: 1px solid rgba(196, 219, 236, .3); background: rgba(8, 20, 30, .55); }
.log__head { display: flex; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid rgba(196, 219, 236, .3); font: 500 11px/1 var(--f-mono); letter-spacing: .16em; color: var(--pale-2); }
.log__live { color: var(--orange); display: flex; gap: 8px; align-items: center; }
.log__live i { width: 7px; height: 7px; border-radius: 50%; background: var(--orange); animation: blink 1.2s steps(2) infinite; }
.log__rows { padding: 8px 0; }
.log__row { display: grid; grid-template-columns: 74px 52px 1fr; gap: 14px; align-items: baseline; padding: 14px 18px; border-bottom: 1px dashed rgba(196, 219, 236, .14); }
.log__row time { font: 400 12px/1.4 var(--f-mono); color: var(--pale-2); }
.log__who { font-size: 12px; letter-spacing: .2em; color: var(--pale-2); }
.log__row p { font-family: var(--f-mono); font-size: 14px; line-height: 1.6; color: #dde8f0; }
.log__row b { color: #fff; font-weight: 500; }
.log__row b.ok { color: var(--green); margin-left: 6px; }
.log__row--user p { font-family: var(--f-sans); font-size: 17px; color: #fff; }
.log__row--user .log__who { color: var(--orange); }
.log__row--warn .log__who { color: var(--orange); }
.confirm { grid-column: 3; display: flex; align-items: center; gap: 14px; margin-top: 12px; padding: 12px 14px; border: 1px solid var(--orange); background: rgba(255, 106, 43, .08); }
.confirm svg { width: 40px; height: 40px; flex: none; transform: rotate(-90deg); }
.confirm__track { fill: none; stroke: rgba(255, 106, 43, .25); stroke-width: 3; }
.confirm__ring { fill: none; stroke: var(--orange); stroke-width: 3; stroke-dasharray: 113.1; stroke-dashoffset: 113.1; }
.confirm b { display: block; color: #fff; font-size: 15px; letter-spacing: .1em; }
.confirm span { font-size: 12px; color: var(--pale-2); }
.rules { display: flex; flex-direction: column; gap: 2px; }
.rule { display: flex; gap: 18px; padding: 20px 4px; border-bottom: 1px solid rgba(196, 219, 236, .16); opacity: .32; transition: opacity .45s; }
.rule.is-on { opacity: 1; }
.rule i { flex: none; width: 38px; height: 38px; display: grid; place-items: center; font: normal 700 11px/1 var(--f-mono); border: 1px solid rgba(196, 219, 236, .45); transition: background .45s, color .45s, border-color .45s; }
.rule.is-on i { background: var(--orange); border-color: var(--orange); color: var(--ink); }
.rule b { display: block; font-family: var(--f-serif); font-size: 21px; color: #f1f5f8; margin-bottom: 4px; }
.rule span { font-size: 14px; color: var(--pale-2); }
.run__foot { max-width: 1400px; margin: 34px auto 0; font: 500 12px/1.6 var(--f-mono); letter-spacing: .12em; color: var(--pale-2); }
.run__foot::before { content: "注　"; color: var(--orange); }

/* ---------------- SHEET 04 案例 ---------------- */
.cases__featured { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: clamp(20px, 2.6vw, 40px); }
.case { position: relative; border: 1px solid var(--ink); background: var(--paper-2); display: flex; flex-direction: column; transition: transform .5s cubic-bezier(.2, .7, .2, 1); }
.case:hover { transform: translateY(-6px); }
.case__draw { position: relative; border-bottom: 1px solid var(--ink); padding: 26px 26px 18px;
  background-image: linear-gradient(rgba(14, 26, 36, .05) 1px, transparent 1px), linear-gradient(90deg, rgba(14, 26, 36, .05) 1px, transparent 1px); background-size: 20px 20px; }
.schem { width: 100%; height: auto; display: block; overflow: visible; }
.schem rect, .schem path { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.schem .schem__doc rect { fill: var(--paper-2); }
.schem text { font: 500 12px var(--f-sans); fill: var(--ink); letter-spacing: .06em; stroke: none; }
.schem .schem__small { font: 400 10px var(--f-mono); fill: var(--ink-2); }
.schem .schem__flow { stroke: var(--ink-2); stroke-dasharray: 4 4; }
.schem .schem__out rect { fill: var(--ink); }
.schem .schem__out text { fill: var(--paper-2); }
.schem .schem__out .schem__small { fill: #b8c4cc; }
.schem__lamp { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.2; transition: fill .3s; }
.schem__lamp.is-on { fill: var(--green); }
.schem__lamp--bad.is-on { fill: var(--orange); }
.schem .is-hit rect { stroke: var(--orange); fill: var(--orange-tint); }
.schem__diamond { fill: var(--paper-2) !important; }
.stamp {
  position: absolute; top: 18px; right: 20px;
  font-family: var(--f-serif); font-weight: 700; font-size: 20px; letter-spacing: .3em; color: var(--seal);
  padding: 6px 6px 6px 14px; border: 3px double var(--seal); border-radius: 6px;
  transform: rotate(-8deg); opacity: 0;
  mix-blend-mode: multiply;
  -webkit-mask-image: radial-gradient(circle at 30% 40%, #000 60%, rgba(0, 0, 0, .7) 61%, #000 75%);
}
.case__body { padding: 28px 28px 24px; flex: 1; }
.case__client { font: 700 12px/1 var(--f-mono); letter-spacing: .2em; color: var(--orange); margin-bottom: 12px; }
.case__body h3 { font-family: var(--f-serif); font-size: clamp(24px, 2.2vw, 34px); line-height: 1.25; margin-bottom: 14px; }
.case__body p { font-size: 15.5px; line-height: 1.9; color: var(--ink-2); }
.case__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.case__tags li { font: 500 11px/1 var(--f-mono); letter-spacing: .06em; padding: 7px 9px; border: 1px solid rgba(14, 26, 36, .35); }
.case__tb { display: grid; grid-template-columns: auto 1fr auto 1fr; border-top: 1px solid var(--ink); font: 500 11px/1 var(--f-mono); }
.case__tb dt, .case__tb dd { padding: 10px 12px; border-right: 1px solid var(--ink); }
.case__tb dt { opacity: .55; font-family: var(--f-sans); letter-spacing: .12em; font-weight: 400; }
.case__tb dd:last-child { border-right: 0; }

.drawlist { max-width: 1400px; margin: clamp(56px, 8vh, 96px) auto 0; }
.drawlist__cap { font: 500 12px/1 var(--f-mono); letter-spacing: .22em; margin-bottom: 16px; }
.drawlist table { width: 100%; border-collapse: collapse; border: 1px solid var(--ink); background: var(--paper-2); }
.drawlist th { text-align: left; font: 400 12px/1 var(--f-sans); letter-spacing: .18em; padding: 12px 16px; border-bottom: 1px solid var(--ink); border-right: 1px solid rgba(14, 26, 36, .25); opacity: .75; }
.drawlist td { padding: 16px; border-bottom: 1px solid rgba(14, 26, 36, .2); border-right: 1px solid rgba(14, 26, 36, .2); font-size: 15px; transition: background .25s; }
.drawlist td:first-child { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; white-space: nowrap; }
.drawlist td:nth-child(2) { font-family: var(--f-serif); font-size: 17px; font-weight: 700; }
.drawlist td:nth-child(4) { color: var(--ink-2); font-size: 14px; }
.drawlist tbody tr:hover td { background: var(--orange-tint); }
.st { display: inline-flex; align-items: center; gap: 8px; font: 500 12px/1 var(--f-mono); letter-spacing: .08em; white-space: nowrap; }
.st::before { content: ""; width: 7px; height: 7px; border: 1px solid var(--ink); }
.st--on::before { background: var(--green); border-color: var(--green); }
.st--na::before { display: none; }

/* ---------------- SHEET 05 客户 ---------------- */
.clients { padding-left: 0; padding-right: 0; }
.track { position: relative; }
.track__head { padding: 0 var(--gut); }
.track__head .sheet__aside { margin-top: 26px; }
.track__rail { position: relative; width: 260vw; height: 300px; margin-top: 20px; }
.rail { position: absolute; left: 0; right: 0; top: 60px; width: 100%; height: 200px; }
.rail__line { stroke: var(--pale); stroke-width: 2; fill: none; opacity: .75; }
.rail__sleepers { stroke: var(--pale-2); stroke-width: 34; stroke-dasharray: 2 38; opacity: .45; fill: none; }
.stations li { position: absolute; left: var(--x); top: 0; width: 240px; padding-top: 0; }
.stations li::before {
  content: ""; position: absolute; left: 0; top: 188px; width: 14px; height: 14px; margin: -7px 0 0 -7px; z-index: 1;
  background: var(--navy); border: 2px solid var(--pale); transform: rotate(45deg); transition: background .3s, border-color .3s;
}
.stations li::after { content: ""; position: absolute; left: 0; top: 56px; height: 124px; width: 1px; background: rgba(196, 219, 236, .35); }
.stations b { display: block; font-family: var(--f-mono); font-weight: 700; font-size: 44px; line-height: 1; color: #f1f5f8; letter-spacing: -.02em; transition: color .3s; }
.stations span { display: block; font-family: var(--f-serif); font-weight: 700; font-size: 20px; margin: 12px 0 4px; color: #f1f5f8; }
.stations em { font-style: normal; font-size: 13px; color: var(--pale-2); }
.stations span, .stations em { position: relative; top: 150px; }
.stations li.is-passed::before { background: var(--orange); border-color: var(--orange); }
.stations li.is-passed b { color: var(--orange); }
.train { position: absolute; left: 0; top: 188px; width: 70px; height: 12px; margin-top: -6px; z-index: 2; }
.train i { display: block; width: 100%; height: 100%; background: var(--orange); box-shadow: -40px 0 0 -2px rgba(255, 106, 43, .35), -80px 0 0 -3px rgba(255, 106, 43, .15); }

.clients__stats { display: grid; grid-template-columns: repeat(4, 1fr); max-width: 1400px; margin: 80px auto 0; padding: 0 var(--gut); }
.stat { padding: 26px 24px 26px 0; border-top: 1px solid rgba(196, 219, 236, .35); }
.stat + .stat { padding-left: 24px; border-left: 1px solid rgba(196, 219, 236, .16); }
.stat b { display: block; font-family: var(--f-mono); font-size: clamp(40px, 4.4vw, 68px); line-height: 1; color: #f1f5f8; letter-spacing: -.03em; }
.stat span { display: block; margin-top: 12px; font-size: 14px; color: var(--pale-2); letter-spacing: .1em; }
.marquee { margin-top: 80px; border-top: 1px solid rgba(196, 219, 236, .2); border-bottom: 1px solid rgba(196, 219, 236, .2); padding: 26px 0; overflow: hidden; white-space: nowrap; }
.marquee__track { display: inline-flex; will-change: transform; }
.marquee__row { display: inline-flex; align-items: center; gap: 44px; padding-right: 44px; }
.marquee__row span { font-family: var(--f-serif); font-weight: 700; font-size: clamp(36px, 5vw, 76px); line-height: 1.1; color: transparent; -webkit-text-stroke: 1px var(--pale); }
.marquee__row span:nth-of-type(2n) { color: var(--pale); -webkit-text-stroke: 0; }
.marquee__row i { font-style: normal; color: var(--orange); font-size: 18px; }

/* ---------------- SHEET 06 联系 ---------------- */
.contact { min-height: 100vh; display: flex; flex-direction: column; justify-content: space-between; padding-bottom: 0; }
.contact__inner { position: relative; max-width: 1400px; width: 100%; margin: 0 auto; flex: 1; display: flex; flex-direction: column; justify-content: center; }
.contact__mark { position: absolute; right: 0; top: 50%; width: min(34vw, 460px); transform: translateY(-50%); overflow: visible; pointer-events: none; }
.contact__mark .mk { fill: none; stroke: var(--ink); stroke-width: 1.2; }
.contact__mark .mk--o { stroke: var(--orange); stroke-width: 1.6; }
.contact__mark .mk--thin { stroke-width: .8; opacity: .5; stroke-dasharray: 22 5 3 5; }
.contact__mark text { font: 500 11px var(--f-mono); fill: var(--ink); letter-spacing: .08em; }
.contact__mark .mk-dim { stroke: var(--orange); stroke-width: 1; fill: none; }
.contact__mark .mk-dimt { fill: var(--orange); }
@media (max-width: 1100px) { .contact__mark { display: none; } }
.contact__title { font-family: var(--f-serif); font-weight: 700; font-size: clamp(36px, 5vw, 80px); line-height: 1.15; }
.contact__mail {
  position: relative; display: inline-block; align-self: flex-start; margin-top: clamp(28px, 5vh, 56px);
  font-family: var(--f-mono); font-weight: 700; font-size: clamp(34px, 7.4vw, 132px); line-height: 1; letter-spacing: -.03em;
  color: var(--ink);
}
.contact__mail::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -10px; height: 6px; background: var(--orange);
  transform: scaleX(.18); transform-origin: left; transition: transform .6s cubic-bezier(.7, 0, .2, 1);
}
.contact__mail:hover::after { transform: scaleX(1); }
.contact__hint { margin-top: 40px; font-size: 16px; color: var(--ink-2); max-width: 520px; }
.foot { position: relative; max-width: 1400px; width: 100%; margin: 60px auto 0; display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; border: 1px solid var(--ink); border-bottom: 0; background: var(--paper-2); margin-bottom: calc(var(--inset) + 2px); }
.foot__cell { display: flex; border-right: 1px solid var(--ink); font-size: 13px; }
.foot__cell:last-child { border-right: 0; }
.foot__cell span { padding: 14px 12px; border-right: 1px solid rgba(14, 26, 36, .3); opacity: .55; letter-spacing: .14em; white-space: nowrap; }
.foot__cell b { padding: 14px 14px; font-weight: 500; letter-spacing: .06em; white-space: nowrap; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1100px) {
  .titleblock { display: none; }
  .hero__caption { right: var(--gut); }
}
@media (max-width: 900px) {
  :root { --inset: 8px; }
  .frame__refs { display: none; }
  .nav { height: 56px; padding: 0 14px; }
  .nav__links, .nav__en { display: none; }
  .nav__sheet { margin-left: auto; }
  .hero__inner { width: auto; right: var(--gut); bottom: 110px; }
  .hero__caption { display: none; }
  .hero__nodes { display: none; }
  .sheet__head--row { flex-direction: column; align-items: flex-start; gap: 22px; }
  .cap__body { grid-template-columns: 1fr; }
  .cap__figure { position: relative; top: 0; max-width: 520px; margin: 0 auto; }
  .cap__item { min-height: 0; opacity: 1; }
  .run__body { grid-template-columns: 1fr; }
  .log__row { grid-template-columns: 58px 1fr; }
  .log__row time { grid-row: span 2; }
  .log__row p, .confirm { grid-column: 2; }
  .cases__featured { grid-template-columns: 1fr; }
  .kicker { font-size: 10px; letter-spacing: .12em; margin-bottom: 20px; }
  .hero__inner { bottom: 96px; }
  .drawlist table, .drawlist tbody { display: block; }
  .drawlist thead { display: none; }
  .drawlist tr { display: grid; grid-template-columns: 1fr auto; gap: 6px 12px; padding: 16px; border-bottom: 1px solid rgba(14, 26, 36, .2); }
  .drawlist td { padding: 0; border: 0; }
  .drawlist td:first-child { grid-column: 1 / -1; opacity: .55; }
  .drawlist td:nth-child(2) { grid-column: 1; }
  .drawlist td:nth-child(3) { grid-column: 1; grid-row: 3; font-size: 13px; color: var(--orange); }
  .drawlist td:nth-child(4) { grid-column: 1 / -1; }
  .drawlist td:nth-child(5) { grid-column: 2; grid-row: 2; }
  .track__rail { width: auto; height: auto; margin: 30px var(--gut) 0; }
  .rail, .train { display: none; }
  .stations li { position: relative; left: 0; width: auto; padding: 0 0 26px 30px; border-left: 2px solid rgba(196, 219, 236, .4); }
  .stations li::before { left: -1px; top: 10px; }
  .stations li::after { display: none; }
  .stations span, .stations em { top: 0; }
  .stations b { font-size: 32px; }
  .clients__stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .foot { grid-template-columns: 1fr 1fr; }
  .foot__cell { border-bottom: 1px solid var(--ink); }
  .foot__cell--wide { grid-column: span 2; border-right: 0; }
}

/* 减少动态效果 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .cap__item, .rule { opacity: 1; }
  .stamp { opacity: 1; }
}